Class1 Digital Display - Manual (Page 10)

10
Calibration
Calibration matches the display to the paddlewheel transmitter installation and
signal for a given flow rate.
A method of accurately determining flow should be used to calibrate the unit.
A smoothbore nozzle and a Pitot gauge is suitable.
Flowmeter calibration must be performed with the discharge flow stabilized at the
desired calibration flow rate.
Establish and maintain the calibration flow rate for a minimum of 10 seconds to
assure an accurate and stable reading. When the flow is stable, enter the
flowmeter calibration mode.
The calibration mode password for the flowmeter is L L L R R R.
Switches are located at each side of the display.
These switches are activated with the use of a magnet.
Switch activation is visually confirmed by the lighting of the closest decimal point
on the display.
Enter the switch sequence below to enter calibration mode.
L
eft
L
eft
L
eft
R
ight
R
ight
R
ight
L
EFT
S
WITCH
L
EFT
S
WITCH
L
EFT
S
WITCH
R
IGHT
S
WITCH
R
IGHT
S
WITCH
R
IGHT
S
WITCH
If the password is correctly entered,
CAL
will be displayed for 1/2 second
followed by
0
.
Using the right switch on the display, enter the flow rate you intend to calibrate. If
the department will use a standard flow for the discharge, use that figure for
calibration.
The speed that the display increments/decrements increases the longer that the
switch is held. If you pass the flow calibration number, “release” the switch and
reactivate it. The display will “reverse direction” each time the switch is activated
and the speed will start out at the slowest rate.
When the number on the display matches the discharge flow rate, check the Pitot
for the desired pressure and then activate the left switch to complete calibration.
The display will read
donE
and then return to normal operation.
Calibration is now complete.
Calibration